NEW YORK — Given all the injuries the Yankees have sustained this season, the news Friday that set-up man David Robertson was experiencing discomfort in his right shoulder was another gut punch.

Robertson was diagnosed with inflammation in his shoulder and will miss some time.

The original timetable given by manager Joe Girardi Friday night was five or six days. Turns out, it may be less than that.

So, some good news at least for the Yankees.

"They’re going to give me a couple of days," Robertson said in the clubhouse before yesterday’s game. "Do two or three days without throwing, play catch and if everything’s good, throw a little inside the bullpen and be ready to go."

Robertson estimated it might be "another day or two" before he returns to action. But that’s not bad considering the struggles the bullpen has undergone against the Boston Red Sox this weekend.

He received treatment on the shoulder yesterday and will likely do so again today.

The additional good news for the Yankees: Robertson didn’t feel any popping or jamming during his last outing on Thursday night against Boston. Robertson said he felt fatigued once he came back to the clubhouse after his appearance and decided to take a precaution and get it looked at. Something, he said, he would have done at any point during the season.

It was clear that something was amiss with Robertson leading into that Thursday night appearance. The night before, against the Chicago White Sox, he allowed three hits and two earned runs in just one-third of an inning of work.

"I woke up the next morning (Friday) and it didn’t feel right," Robertson said. "It felt like I overused it. I reached back and threw a little extra on some pitches and my shoulder just didn’t feel good the next day."

Robertson said he has never had any history of shoulder problems throughout his career. (He even went so far as to knock on the wood of his locker when asked about it yesterday morning.) But he did stress that it had nothing to do with his extra usage over his past four appearances.

On Aug. 25, Robertson threw two innings. Then, on Aug. 30, he was asked to go 1⅓ innings.

"I don’t think the multi-innings played a role in it at all," he said. "I had a lot of momentum going the other day in the game. I think that’s what probably made me push it a little too hard."

The Yankees also got good news on reliever Shawn Kelley, who has been missing time with a triceps inflammation. Kelley, who has not pitched since Sept. 1, threw a bullpen session yesterday and felt ready to go.

He threw 12-15 pitches, mostly fastballs and sliders, and expects to be cleared to be back in the bullpen for today’s series finale against Boston.

"I pretty much knew yesterday (Friday) that I was going to be okay," Kelley said. "Because I could tell, playing catch, that whatever was bothering me was gone."

• Less encouraging was the update on lefty specialist Boone Logan. After undergoing an MRI yesterday following discomfort in the top part of his left elbow on Friday night, it was revealed that Logan has inflammation in the area.

"He’ll probably be three days off," Girardi said. "And we’ll go from there."

• Before yesterday’s game, the Yankees brought up reliever Jim Miller from Triple-A Scranton/Wilkes-Barre. To make room on the 40-man roster, pitcher Vidal Nuno (strained left groin) was reinstated from the minor-league 7-day disabled list, recalled from Triple-A and placed on the 60-day major league DL.

• Red Sox center fielder Jacoby Ellsbury may be out indefinitely with a right foot injury, which doctors are trying to determine is a deep bone bruise or a fracture.

Ellsbury was sent back to Boston to be examined by a specialist, as well as an orthopedist. He is scheduled to go to Denver for a second opinion.

Manager John Farrell said an MRI taken yesterday showed swelling and inflammation. Ellsbury has been put in a walking boot, after reaggravating the original injury — fouling a ball off the foot on Aug. 28 — in the 10th inning on Thursday night.